Study on Extraction of Theine from Tea

[Objective]The purpose was to discuss the method of extracting theine from tea.[Method]With 4 tea varieties produced in Hanzhong of Shaanxi as tested materials,the theine was extracted from tea by Soxhlet extraction and the structure of theine was characterized by infrared spectrometer to study the influence of tea variety on theine yield.[Result]The tea variety had bigger influence on theine yield.The theine yield from the low-grade tea Dayeqing(1.32%) was much higher than that from the high-grade tea special-grade Hanshuiyinsuo(0.51%).Different teas had different theine contents and the theine content in low-grade tea was higher than that in high-grade tea.Hanzhong tea tasted fresh and pure,it was mainly because its theine con-tent was lower than that in common tea.[Conclusion]The theine could be extracted from tea effectively by Soxhlet extraction and the operation technology was simple and feasible.